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The exterior gets a new front lip spoiler, carbon fiber mirror housings and different sets of 21” HARTGE wheels. There is also a set of lowering springs reducing the ride height by 25mm at the front and 20mm at the rear. HARTGE also offers a complete stainless steel sports exhaust system.
The Hartge M5 uses a set of lowering springs that bring the car closer to the road by 25 mm up front and 20 mm at the back.
Interior changes are limited, but customers can order aluminum pedals, velour floor mats and Hartge badging.

The most important upgrade is definitely under the hood where the 4.4 liter twin turbo V8 engine can now produce a total output of 642 HP (472 kW) and 810 Nm of torque (597 lb-ft), 80 HP (60 kW) and 130 Nm (96 lb-ft) more than the standard version. This is translated into a 0 to 100 km/h acceleration of 4.2 seconds and a top speed of 305 km/h (190 mph).